For the past year, I've had endless trouble with my Hasselblad 503CW body and numerous film backs. I've even sent it in for repair to Hasselblad but asked for the equipment back, because they were going to charge me £400 just to service two film backs. The body itself was going to cost another £400 to service.
On top of this, I had a local camera repair outfit 'service' the film backs and I think they just charged me for doing nothing. I really believe they didn't service the film backs because now I've had them serviced properly, I can feel they are lubricated.
I put out feelers through this blog for recommendations and I got a few people telling me about JDCamTech. I'm happy to say that John at JDCamTech was extremely efficient, and did a terrific job of servicing the entire outfit for around £300. He explained that Hasselblad equipment needs to be re-lubricated every three to five years. My outfit is running really smooth now.
If you do have any problems with your cameras, then I can't recommend him enough. I feel that credit should be given, where credit is due, and so if you do feel you have trouble with your camera equipment, please give John at JDCamTech a call.